Archaeologists have identified three undiscovered Roman fortified camps across northern Arabia.The University of Oxford school of archaeology made the discovery in a remote sensing survey, using satellite imagery.It said it could be evidence of an "undocumented military campaign" across south east Jordan into Saudi Arabia.Dr Michael Fradley, who led the research, said: "We are almost certain they were built by the Roman army.In the report, published in the journal Antiquity, he explained his conclusion was based on the "typical playing card shape of the enclosures with opposing entrances along each side".Dr Fradley added that the westernmost camp was significantly larger...